WASHINGTON 
President Barack Obama says he wants to make sure millionaires are taxed at higher rates than their secretaries. The data say they already are.

"Warren Buffett's secretary shouldn't pay a higher tax rate than Warren Buffett. There is no justification for it," Obama said as he announced his deficit-reduction plan this week. "It is wrong that in the United States of America, a teacher or a nurse or a construction worker who earns $50,000 should pay higher tax rates than somebody pulling in $50 million."

On average, the wealthiest people in America pay a lot more taxes than the middle class or the poor, according to private and government data. They pay at a higher rate, and as a group, they contribute a much larger share of the overall taxes collected by the federal government.

The 10 percent of households with the highest incomes pay more than half of all federal taxes. They pay more than 70 percent of federal income taxes, according to the Congressional Budget Office.

In his White House address on Monday, Obama called on Congress to increase taxes by $1.5 trillion as part of a 10-year deficit reduction package totaling more than $3 trillion. He proposed that Congress overhaul the tax code and impose what he called the "Buffett rule," named for the billionaire investor.

The rule says, "People making more than $1 million a year should not pay a smaller share of their income in taxes than middle-class families pay." Buffett wrote in a recent piece for The New York Times that the tax rate he paid last year was lower than that paid by any of the other 20 people in his office.

There may be individual millionaires who pay taxes at rates lower than middle-income workers. In 2009, 1,470 households filed tax returns with incomes above $1 million yet paid no federal income tax, according to the Internal Revenue Service. But that's less than 1 percent of the nearly 237,000 returns with incomes above $1 million.

This year, households making more than $1 million will pay an average of 29.1 percent of their income in federal taxes, including income taxes, payroll taxes and other taxes, according to the Tax Policy Center, a Washington think tank.

Households making between $50,000 and $75,000 will pay an average of 15 percent of their income in federal taxes.

Lower-income households will pay less. For example, households making between $40,000 and $50,000 will pay an average of 12.5 percent of their income in federal taxes. Households making between $20,000 and $30,000 will pay 5.7 percent.

The latest IRS figures are a few years older - and limited to federal income taxes - but show much the same thing. In 2009, taxpayers who made $1 million or more paid on average 24.4 percent of their income in federal income taxes, according to the IRS.

Those making $100,000 to $125,000 paid on average 9.9 percent in federal income taxes. Those making $50,000 to $60,000 paid an average of 6.3 percent.